%0 Journal Article %A A. I. Stepanets %T Approximation of continuous periodic functions of many variables by spherical Riesz means %J Matematičeskie zametki %D 1974 %P 821-832 %V 15 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a18/ %G ru %F MZM_1974_15_5_a18